Hi, The task description for the EMOTION data is as follows:
*This task was adapted from the one developed by Hariri and colleagues which had shown evidence as a functional localizer (Hariri et al., 2002) with moderate reliability across time (Manuck et al., 2007a). Participants are presented with blocks of trials that either ask them to decide which of two faces presented on the bottom of the screen match the face at the top of the screen, or which of two shapes presented at the bottom of the screen match the shape at the top of the screen. The faces have either angry or fearful expressions. Trials are presented in blocks of 6 trials of the same task (face or shape), with the stimulus presented for 2 s and a 1 s ITI. Each block is preceded by a 3 s task cue (“shape” or “face”), so that each block is 21 s including the cue. Each of the two runs includes 3 face blocks and 3 shape blocks. However, there was a bug in the E-prime script for this task such that the task stopped short of the last three trials of the last task block in each run. To promote comparability across participants, we decided not to fix the bug (given that a number of subjects had already been run before it was detected) as we thought it would have minimal impact on the data. In phase I, we compared this task to one using negative and neutral IAPS pictures (see Supplemental Materials).* A typical EV file looks like this (fear.txt) 32.053 18 1 74.196 18 1 116.338 18 1 The block length indicated is 18, where as the description says 21. My question is if the onset listed here is that of the first trial or of the cue. My confusion is based on 2 things: 1. For the working memory (WM) data, the block lengths include the time of the cue. The onsets are that of the cue. 2. The bug reported says the last 3 trials are cut-off/ missing, and if I do the math it seems this can't be the onset of the cue. I wanted to confirm this. Please let me know. Sincerely, Manasij _______________________________________________ HCP-Users mailing list HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users